The Customize-able weight cartridge kit Fits Predator cues except Predator BK2s, IKON 1st Generation and the Predator Sport Playing Cue. Individual weights are 0.1 oz, 0.2 oz, 0.3 oz, 0.4 oz, 0.5 oz, 0.7 oz, 1.0 oz and 2.0 oz sizes, which are all stack-able.. A small and convenient carrying case is included as well as a specially designed wrench and handle for adding and removing weights.